In 1939, on the eve of World War II, Joseph Stalin and German dictator Adolf Hitler (1889-1945) signed a nonaggression pact. Stalin then proceeded to annex parts of Poland and Romania, as well as the Baltic states of Estonia, Latvia and Lithuania. He also launched an invasion of Finland. Then, in June 1941, Germany broke the Nazi-Soviet pact and invaded the USSR, making significant early inroads. (Stalin had ignored warnings from the Americans and the British, as well as his own intelligence agents, about a potential invasion, and the Soviets were not prepared for war.) As German troops approached the Soviet capital of Moscow, Stalin remained there and directed a scorched earth defensive policy, destroying any supplies or infrastructure that might benefit the enemy. The tide turned for the Soviets with the Battle of Stalingrad, from August 1942 to February 1943, during which the Red Army defeated the Germans and eventually drove them from Russia.